The effects of B 2O 3 with w=0.5% to 3.0% on the structure and microwave properties of Ba(Mg 1/3Ta 2/3)O 3(BMT) ceramic has been investigated. It has been found that B 2O 3 doping can improve the BMT microwave ceramic sintering. When w(B 2O 3) is equal to 1%, the densification sintering temperature of BMT ceramic has been reduced to 1200°C, the apparent density ρ is equal to 7306 g/cm 3, the relative density is 95.7%. The BMT microwave ceramic system has good microwave dielectric properties as follows: ε r=22.08, the quality factor Q·f =88 000 GHz(10 GHz), the coefficient of frequency to temperature τ f =3.3×10 -6/°C.
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